Improvement in hot-air furnaces



2 Sheets--Sheet 2.

s.E;HEwEs Improvement in Hot-Air Furnaces.

Patented .|une13,1871.'

-No.n5,956

INVENTvOR 1 2 Sheets--Sheet l. S. E. H EWES..

Improvement in Hot-Air Furnaces.

-No, 115,956. 4 Patented 1un13,1871' Plas,

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j mm my UNITED `Suirrns SHUBAEL n, H'nwns, or ALBANY, Nnw YORK.

' IMPRoi/EMENT IN Hor-AIR FuRNAc'Es.

Specification forming part of LettcrsPatent No. 115,956, dated June 13, 1871.

I, SHUBAEL E. Hnwns, of the city and -county of Albany and State of New York,

have invented a new and useful H eatin g-Stove or Furnace, of which the' following is a speciiication:

Nature and Objects ofthe Intention. The subject of this invention is a base-burning or magazine stove, and some parts of the invention have special reference to adapting it for use with bituminous coal.

The invention relates, r'st, to a conductor by which iniiammable gases evolved are taken from the upper part ofthe magazine and delivered in a heated state into the upper partl of the fire-chamber to be there consumed. It relates, second, to a provision by which the magazine is surrounded on all sides (excepting at the fuel-feed door) by an annularchamber, to which air is admitted from outside the furnace, which annular chamber is surrounded on its sides and -top by a continuous smokeflue. It further relates to the combination of two annular air-chambers, each supplied with air from outside, said ehamberseommunicating at top and having a .smoke-liuc interposed between the'm, as hereinafter described. The

invention further relates to the construction of a crown-plate, which surmounts the nre-chamber and is used for the attachment of the upper parts of the stove. The invention further relates to a drum or radiator ofpecul-y iar construction; and further, to an improved damper, which is employed in connection therewith.

Description of the Accompanying Drawing.

lFigure 1 is a vertical section of my improved stove or furnace. Fig. 2 is a horizontal section thereof on the line :x: Fig. 1. Fig. 3 is a vertical section of the drum or regulator. Fig. 4. is a horizontal section thereof at y y, Fig. 3. Fig. 5 is an external elevation of the lower part of said drum. Fig. 6 is a front view of the stove or furnace. Fig. 7 is a vertical section of an improved crown-plate surmounting the combustion-chamber, and employed for the support and attachment of the upper parts. The same kfigure shows also sections of parts of the flre-pot and of the hot-air .ash-pit.; D, the grate; and H an annular airheating plate, the form and operation of which arel described in a separate application for Letters Patent. E is an external shell or .casing, within which` is a chamber, El, supplied with air through openings b, in the bottom plate B of the stove. F is the re-pot. I I represent the fuel-magazine, the lower part of which projects downward into the re-chamber, and may be made removable, soV that it can be removed as often as required. Around this lower part of the magazine is a combustion-chamber, F. 'I is a crown-plate, surmounting the lire-chamber, and having extended 'openings t, through which the gases pass into the combustion-chamber L, above. The construction of this plate is best shown in Fig. 7. It is employed for the attachment of. the iire-pot, the magazine, and the sections of the external casing E of the air-heating chamber. t' are openings in said plate, through which the air rises freely. Gr is a pipe, communicating with the upper part of the magazine I, from which it is extended downward, within the annular flue L', across the {irechamber F, from whence it projects upward and discharges within the combustion-chamber L, the mouth of the tube beingextended in width, as represented by the dotted lines in Fig. `2. The function of this tube is to receive all the gases evolved by the heat within the magazine and conduct them to the aforesaid combustion-chamber, where they are delivered in a heated state and immediately conrounding the magazine on all sides with air it is kept at the lowest possible temperature. The two air-spaces E1 and E2 are connected at the upper part through any necessary number of pipes, e. The inner air-chamber E2 is supplied with air through openings c2 in the door jamb. vN represents a vertically-sliding door,

formed, in its upper part, with an oblique ange, N', which, when the door is lowered, constitutes a chute or conductor to assist in supplying the magazine with fuel. Around the smoke-flue K, in the top O of the furnace, any number of hot-air pipes may be arranged,

as illustrated by the dotted lines in Fig. l,

illustrated by the full lines in Figs. 3, 4, and`5,

the gases Will be required to traverse three times the length of the drum so as to more ett'ectually give out their heat but when the parts are in the position illustrated by the dotted lines in Fig. 5, a direct passage will be afforded through the drum so as to produce a strong draft in kindling the re. The internal arrangement of the drum is exhibited in Fig. 3, in order to illustrate the action and effect of the damper and the loose arm S, which I have combined therewith. By attaching the arm S loosely to the shaft R and causing it to control the same through the pins s s, striking a stud, i, projecting from the shaft It, I adapt the said arm to move through a space of nearly one hundred and eighty degrees, while the damper may move not more than one-third as far. The weighted arm is thus caused to rest in a nearly horizontal position at each end of its stroke, so as to hold the damper firmly in either position.

I claim as my invention- 1. The pipe G, constructed and employed, substantially as described, to conduct gases from the upper part of the magazine and deliver them in a heated state Within the combustion-chamber.

2. The inner annular chamber E, supplied With cold air directly from the exterior, surrounding (excepting at the fuel-feed door) the sides and top of the magazine I, and surrounded on its oWn sides and top by the continuous smoke-flue L', as herein represented and described.

3; The two annular chambers E1 and E2, each supplied independently with air from the exterior, and communicatingv at top through pipes e, in combination with the annular smoke-flue L' interposed between the vertical sides and also between the upper parts of said air-chambers, as explained.

4. The connecting crownplate T t t','conA strncted and employed substantially as and for the purposes set forth.

5. The drum K', constructed with partitions P IJ', arranged substantially as herein de scribed, in combination with the damper Q,

shaft or pivot R, and Weighted arm S, arranged to operate substantially as described.

S. E. HEWES.

Witnesses:

WALTER ALLEN, WM. H. BRnRnroN, Jr. 

